Grounding and bonding are mandatory for metallic trays. Tray fill limits must be calculated properly. Firestop systems are required at penetrations. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. One of the most recognized frameworks globally is the IEC standard for. When developing our cable support OBO can offer reliable solutions for systems, three attributes are at the routing and fastening cables securely core of what we do: efficiency, resil- for each of these installation challeng-ience and safety. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. Grounding and bonding are mandatory for metallic trays.